Buongiorno,
per effettuare la mappatura il mio sito internet e renderlo più appetibile ai motori di ricerca, mi si chiede di verificare su questo indirizzo il codice html
http://validator.w3.org.
ci sono 5 errori e per tutti la stessa soluzione, riportata alla fine.
Dato che non ho la minima idea di cosa indichino quei comandi posso semplicemente cancellarli o devo provvedere inserendo stringhe di codice differenti?
Ringrazio.
Line 22, Column 52: Attribute "leftmargin" is not a valid attribute
…ge_bg" bgcolor="#ffffff" leftmargin="0" marginheight="0" marginwidth="0" topm
Line 22, Column 69: Attribute "marginheight" exists, but can not be used for this element.
… bgcolor="#ffffff" leftmargin="0" marginheight="0" marginwidth="0" topmargin="0">
Line 22, Column 85: Attribute "marginwidth" exists, but can not be used for this element.
…in="0" marginheight="0" marginwidth="0" topmargin="0">
Line 22, Column 99: Attribute "topmargin" is not a valid attribute. Did you mean "marginwidth" or "marginheight"?
…eight="0" marginwidth="0" topmargin="0">
Line 232, Column 12: Attribute "height" exists, but can not be used for this element.
<tr height="20">
✉
You have used the attribute named above in your document, but the document type you are using does not support that attribute for this element. This error is often caused by incorrect use of the "Strict" document type with a document that uses frames (e.g. you must use the "Transitional" document type to get the "target" attribute), or by using vendor proprietary extensions such as "marginheight" (this is usually fixed by using CSS to achieve the desired effect instead).
This error may also result if the element itself is not supported in the document type you are using, as an undefined element will have no supported attributes; in this case, see the element-undefined error message for further information.
How to fix: check the spelling and case of the element and attribute, (Remember XHTML is all lower-case) and/or check that they are both allowed in the chosen document type, and/or use CSS instead of this attribute. If you received this error when using the <embed> element to incorporate flash media in a Web page, see the FAQ item on valid flash.
